'Calculate the magnitude and direction of the magnetic field B at a point P due to a current I=11.0 A in the wire shown: a) Segment BC is an arc of a circle with radius b = 30.0 cm, and point Pis at the center of curvature of the arc. Use the law of Biot and Savart to derive an expression for magnetic field B at point due to segment BC (6) Segment DA is an arc of a circle with radius a = 20.0 cm; and point P is at its center of curvature. Use your expression of part (a) to find B at point P due to segment DA (c) Segments CD and AB are straight lines of length 10.0 cm each:'